Do we earthlings share some DNA with Marvin the Martian (Image: Ken's Oven via Flickr)
Men are from Mars and women are from Venus. That's one theory ... another is that all life on Earth descended from organisms that originated on the Red Planet before hitching an interplanetary journey aboard meteorites to Earth. In an effort to provide a definitive answer, researchers at MIT and Harvard are developing an instrument to compare the genetic makeup of Martian microbes with that of terrestrial life. If they find correlations between the two it could prove that we are all descended from Martians, which would make us invaders from Mars.